[patch] Provide support for new version of Ansible and the older versions - DB2 role

Author: karol-czarnecki

ibm/mas_devops/roles/db2/tasks/install/main.yml

@@ -151,7 +151,7 @@
         name: ibm-registry
         namespace: "{{ db2_namespace }}"
       data:
-        .dockerconfigjson: "{{ new_secret | b64encode }}"
+        .dockerconfigjson: "{{ new_secret | to_json | string | b64encode }}"
   register: secretUpdateResult
 
 - name: "Delete old db2 subscription, operand request and csv from {{ ibm_common_services_namespace }}"